What is a symptom of a failing power supply?

What is a symptom of a failing power supply?

• The computer sometimes does not turn on.
• The display has only a blinking cursor.
• The power cord will not attach properly to either the power supply or wall outlet or both.
• The computer displays a POST error code.
  

  Answers Explanation & Hints: A failing power supply could also cause a computer to reboot unexpectedly. If the power cord does not attach properly, then it is likely that the wrong type of power cord is being used.